I do not believe there is any difference in the way the words are used.... completely interchangable.
"Antenna" is probaly the more technicaly correct word.
"Aerial" is probaly the more lay persons word.....derived from a time when both transmittiers and recievers commonly used a length of "aerial wire" as an antenna........an "aerial wire" is the term still used for any wire strung between insulators on poles, be it used for radio transmission, phone lines or power transmission.
Don't sweat it.
cheers